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Digestive System Student Instructions: You will need Acrobat Reader 11 or later to complete this worksheet. We suggest you save regularly - your teacher will tell you which questions to answer and how to submit when you have finished. The fields with 0 and drop down lists are for Teacher use only. Comments Name: Class: Date (mm/dd/yyyy): Total (75) 0 Percent 0.00% Bonus (25) 0 1 What are the general functions of the digestive system? 2 Describe the specific functions of the following structures in the digestive system: 0 0 Mouth Stomach Pancreas Liver Gall bladder Small Intestine Large Intestine 3 Select colors from the drop down lists to identify these parts of the digestive system: 0 Please select the color Red Green Purple Blue Pink Black Large Intestine Please select the color Small Intestine Please select the color Liver Please select the color Stomach Please select the color Mouth Please select the color Tongue 4 0 In the diagram below, list all the substances that are added to, or extracted from, the frog’s digestive tract as food passes through. Also describe the state of the food at each stage. Cloaca Large intestine Small intestine Stomach Mouth Substances added Substances extracted Physical-chemical state of food 5 0 Food is digested in two ways. Mechanical digestion physically breaks down food into smaller particles, while chemical digestion uses chemicals to break down individual nutrients. In the chart below, determine for both frogs and humans which types of digestion (chemical and/or mechanical) occur in each portion of the digestive tract. Humansl Mouth Stomach Small intestine Large intestine 6 In the frog’s mouth, what function do the vomerine teeth serve? 7 The stomach breaks down food in the following ways: 8 a. Where is pepsinogen produced? 0 0 0 b. What changes it into pepsin? c. What is the function of pepsin? To break down proteins 9 What are the folds of the stomach lining called? 0 10 How does the digestive system avoid digesting itself?es and acid. 0 Frogs 12 a. How are nutrients passed from the small intestine to the liver? 0 b. Why are these nutrients passed to the liver? 12 Which part of the small intestine do bile and enzymes from the liver and pancreas enter? 13 How do the secretions from the liver and pancreas interact with each other in the small intestine? 14 a. Use the pencil tool to circle the most effective surface for absorption. 0 0 0 b. Why is this more effective than the others? 15 a. What does the pancreas produce? 0 b. How do these products get into the small intestine? Digestive System • 5 16 How does bile get from the liver to the duodenum?duct 17 What is the function of bile?ch acid and activate enzymes. 0 0 18 0 Compare to human a. Where do feces exit in frogs? b. In humans? For further thought... 0 Why are some enzymes introduced into the digestive system in an inactive form? For further thought... 0 A frog’s intestine absorbs toxins, such as venom in insects, along with nutrients. The liver then filters these toxins out. Why is this filtering so important? Independent Study Unit Why are vitamins B and K produced by bacteria in the large intestine and not in the stomach? 0 The Crossword 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 ACROSS 1. 5. 8. 10. 13. 14. 16. 17. This controls the opening of the cloaca (9) It’s an endocrine gland and a digestive organ! (8) In the liver, fats, sugars and amino acids are stored as this (8) Unused substances are expelled as this (5) These are broken down by pepsin and intestinal enzymes (7) This stores food and breaks it into small particles (7) This process is completed in the small intestine (9) Enzyme that forms from pepsinogen (6) DOWN 2. The canal where the large intestine narrows (6) 3. The large intestine empties into this (6) 4. The largest gland in the body (5) 6. Folds in the stomach (5) 7. First section of the small intestine (8) 9. These produce secretions in the stomach (6) 11. Tube between mouth cavity and stomach (9) 12. Bile is used to emulsify this substance (4) 15. The pancreatic ducts empty into this duct (4)